EP3491577B1 - Verfahren und system zum erfassen einer spezifischen relativen position zwischen zwei objekten - Google Patents

Verfahren und system zum erfassen einer spezifischen relativen position zwischen zwei objekten Download PDF

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Publication number
EP3491577B1
EP3491577B1 EP17757796.2A EP17757796A EP3491577B1 EP 3491577 B1 EP3491577 B1 EP 3491577B1 EP 17757796 A EP17757796 A EP 17757796A EP 3491577 B1 EP3491577 B1 EP 3491577B1
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EP
European Patent Office
Prior art keywords
receiver
antenna
circuit
radiofrequency
reader
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EP17757796.2A
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English (en)
French (fr)
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EP3491577A1 (de
Inventor
Thierry Thomas
Jacques Reverdy
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10118—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the sensing being preceded by at least one preliminary step
    • G06K7/10128—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the sensing being preceded by at least one preliminary step the step consisting of detection of the presence of one or more record carriers in the vicinity of the interrogation device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/48—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
    • G06K7/10415—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM
    • G06K7/10425—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM the interrogation device being arranged for interrogation of record carriers passing by the interrogation device
    • G06K7/10435—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM the interrogation device being arranged for interrogation of record carriers passing by the interrogation device the interrogation device being positioned close to a conveyor belt or the like on which moving record carriers are passing
    • G06K7/10455—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM the interrogation device being arranged for interrogation of record carriers passing by the interrogation device the interrogation device being positioned close to a conveyor belt or the like on which moving record carriers are passing the record carriers being fixed to an endless tape or at least not fixed to further objects

Definitions

  • the invention relates to the location of objects by means of tags and radio frequency antennas, and in particular to the location of the relative position of objects with maximum precision.
  • the location of the RFID reader is only approximate. Therefore, deducing the location of an RFID tag positioned nearby is even more approximate. Such a location also proves to be complex to implement.
  • the document US20080278289 describes a device for locating an RFID tag using tags for generating a magnetic field.
  • the RFID tag measures the level of magnetic fields produced by these tags, positioned in known locations.
  • the position of the tag is estimated by triangulation between the magnetic fields measured for different tags, by means of calculations internal to the tag or else at the level of an RFID reader.
  • the location of the tag is relatively approximate. Its location also requires a mesh with a large number of beacons and the measurement of an electromagnetic field on a frequency band different from the band of communication with the reader.
  • the invention aims to resolve one or more of these drawbacks.
  • WO99 / 21144 relates to a device for detecting RFID tags on a conveyor path. This document proposes a distribution of transponders along a path. This document relates to the use of a reader having an antenna elongated in a direction perpendicular to the conveying direction.
  • JP2003148653 relates to a principle of attaching multiple RFID tags to different locations of an elongated and buried pipe or cable. From the identifiers of the labels, the geometry of the buried element is traced by subsequent measurements / detections with a reader.
  • EP2077518 describes principles of determining the distance between a reader and a receiver based on the increase in mutual inductance of their antennas as they are brought together.
  • US2007 / 0290846 D5 describes a principle for determining the distance and the orientation between a reader and a receiver, as a function of the inductive coupling between their antennas. The document also proposes to modulate the transmission power.
  • the invention thus relates to a system for detecting a specific relative position between a radiofrequency reader and a radiofrequency receiver, as defined in claim 1.
  • the invention also relates to the variants defined in the dependent claims. Those skilled in the art will understand that each of the features of the variants of the dependent claims can be combined independently with the features of the independent claim, without constituting an intermediate generalization.
  • the invention further relates to a method of detecting a specific relative position between a radio frequency reader and a radio frequency tag, as defined in the appended claims.
  • a detection system 1 An example of a detection system 1 is schematically illustrated on figure 4 , and more in detail later.
  • the communication device of such a detection system 1 comprises a base station or radiofrequency reader 2, and an autonomous receiver 3 generally designated by the term contactless tag or card, operating as a receiver and powered remotely.
  • a radiofrequency magnetic field link is established between the reader 2 and the receiver 3. This magnetic field is in an almost stationary state.
  • the coupling members of the reader 2 and of the receiver 3 include loops, windings or coils forming respective antenna circuits, provided for inductive coupling.
  • Electronic components are associated with each antenna circuit with the function of achieving frequency tuning, damping or impedance matching. The association of the antenna circuit and the electronic components is usually designated by the term antenna.
  • the figure 1 schematically illustrates an example of a radiofrequency reader 2 for a detection system 1 according to the invention.
  • the reader 2 comprises a high-frequency signal supply circuit 21, a transmit / receive antenna 22, a receive antenna 23, a processing circuit 24, and a coupler 25 (in this example).
  • the power supply circuit 21 is modeled by a generator 210 connected in series with a resistor 211. More precisely, the power supply circuit 21 can consist of a signal source 212, a modulator 213, followed by a power amplifier 214 (including resistor 211), as shown in figure 2 .
  • the transmit / receive antenna 22 is modeled by a resonant circuit RLC connected to the supply circuit 21 via the coupler 25.
  • the receive antenna 23 is modeled by a resonant circuit RLC connected to the processing circuit 24
  • the input signal of the processing circuit 24 for the antenna 22 is supplied by the coupler 25.
  • the coupler 25 can for example be a simple branch connection, a directional coupler, or a current probe.
  • An example of processing circuit 24 will be described in more detail with reference to figure 3 .
  • the transmit / receive antenna 22 can be modeled as a resistor 220, a capacitor 221 and an inductor 222 connected in series. Inductor 222 models the coils or windings of an antenna circuit.
  • the antenna circuit of the reception antenna 22 will therefore be designated subsequently by this same reference 222.
  • the supply circuit 21 is configured in a manner known per se to supply the transmission / reception antenna 22 in such a manner. to intentionally produce a radiofrequency electromagnetic field.
  • Reader 2 comprises for this purpose a communication circuit including a radiofrequency transmission chain, in a manner known per se.
  • the processing circuit 24 is connected to the terminals of the antennas 22 and 23 to process the electrical signals at the terminals of these antennas 22 and 23. According to a variant, a port 240 of the processing circuit 24 is connected to the coupler 25. A port 241 of the Processing circuit 24 is connected to antenna 23. One or two radiofrequency reception channels from the communication circuit are for example included in this processing circuit 24.
  • the receiving antenna 23 can be modeled as a resistor 230, a capacitor 231 and an inductor 232 connected in series. Inductor 232 models the coils or windings of an antenna circuit.
  • the antenna circuit of the reception antenna 23 will therefore be designated subsequently by this same reference 232.
  • the communication circuit comprises a non-detailed radiofrequency reception chain, connected to the reception antenna 23.
  • the figure 4 schematically illustrates an example of a radiofrequency tag receiver 3 for a detection system 1 according to the invention.
  • Receiver 3 is usually modeled by a parallel RLC circuit, as illustrated on figure 3 .
  • the receiver 3 is modeled by an antenna 31, connected to a chip 30.
  • the antenna 31 is modeled by an inductor 310 connected in series with a resistor 311.
  • the inductor 310 models the coils or windings of an antenna circuit. .
  • the antenna circuit of the antenna 31 will subsequently be designated by this same reference 310.
  • the chip 30 is here modeled by a capacitor 301 and a resistor 300 connected in parallel. Resistor 300 generally models the internal circuits of chip 30, capacitor 301 models a frequency tuning capacitor.
  • the resonant frequency of the circuit formed by the receiver 3 is generally very close to the working frequency.
  • a chip such as that marketed by the company NXP under the reference SL2S2002FTB: ICODE SLIX can for example be used.
  • the inductive coupling between reader 2 and receiver 3 allows energy transfer from reader 2 to receiver 3 by mutual inductance.
  • the magnetic field produced in transmission by the antenna circuit 222 of the reader 2 at the level of the antenna circuit 310 of the receiver 3 positioned nearby, induces an electromotive force fem within this antenna circuit 310: fem ⁇ 0 * H * S * ⁇ .
  • receiver 3 uses the load modulation technique, by modifying one of its electrical parameters, Le, Ce or R. In the most frequently used solution, a receiver 3 modulates the value R.
  • the load modulation causes a modulation of the current regime in the antenna circuit 310 when the latter is subjected to the primary electromagnetic field produced by the reader 2. This current in the antenna circuit 310 corresponds to the field secondary electromagnetic reaction produced by the receiver 3.
  • the reader 2 thus comprises a transmit / receive antenna circuit 222 and a receive antenna circuit 232.
  • the antenna circuits 222 and 232 are fixed with respect to each other, for example by being fixed on the same support.
  • the antenna circuits 222 and 232 advantageously have a geometric configuration of the lowest possible mutual inductance, preferably substantially zero.
  • the signal induced by the electromagnetic field produced by the antenna circuit 222 in the antenna circuit 232 disturbs the processing circuit 24 to a minimum.
  • This formula uses a curvilinear double integral, which can be decomposed into mutual partial inductances by a decomposition into sections of the two circuits C1 and C2. Both circuits have a sense of course, these meanings are taken by convention. These directions of travel imply a sign to the mutual inductance, as well as to the mutual partial inductances resulting from a decomposition of the circuits C1 and C2.
  • This formula also makes it possible to derive basic rules applicable to two straight sections.
  • the term under the double integral shows that if the sections are perpendicular, their mutual inductance is zero, and if the sections are parallel, their mutual inductance is inversely proportional to the distance which separates the two sections.
  • the mutual inductance is positive if the direction is the same in the two sections and negative if the directions are opposite.
  • the figure 6 is a front view of an example of an antenna circuit 222 of the radiofrequency reader 2.
  • the antenna circuit 222 comprises a wire conductive track (here illustrated in projection in a plane).
  • the conductive track (here made of copper) is in practice provided on a cylindrical wall of circular section.
  • the antenna circuit 222 chosen has a length of 100 mm, a width of 100 mm, a cylinder radius of 51 mm and a wire diameter of 1 mm.
  • the antenna circuit 222 here has an inductance of 513nH.
  • the wire conductive track of the antenna circuit 222 generally comprises two rectangular loops connected in series and in opposite directions to have a shape substantially in 8.
  • the antenna 22 has been configured to communicate at a frequency of 13, 56MHz.
  • the figure 7 is a front view of an example of an antenna circuit 232 of the radiofrequency reader 2.
  • the antenna circuit 232 comprises a wire conductive track (here illustrated in projection in a plane).
  • the wire (here made of copper) of the antenna circuit 232 here generally follows the outline of a rectangle in projection.
  • the conductive track is in practice provided on a cylindrical wall of circular section.
  • the antenna circuit 232 chosen has a length of 90 mm, a width of 60 mm, a cylinder radius of 52 mm and a wire diameter of 1 mm.
  • the antenna circuit 232 here has an inductance of 258nH.
  • the figure 8 is a perspective view of an exemplary antenna circuit 310 of the radio frequency tag 3.
  • the antenna circuit 310 has a conductive wire (copper) wound in a helix.
  • the antenna circuit 310 chosen has a helix diameter of 10 mm, a helix length of 30 mm, a number of 10 windings (in order to reduce the calculation time, the number of turns was intentionally reduced but could be adapted in reality, so that the inductance of the antenna circuit 310 allows a resonant frequency close to the working frequency, for example 13.56 MHz (taking into account the capacitance 301 on board in chip 30, increased by the parasitic capacitance of antenna circuit 310)), and a wire diameter of 0.2 mm.
  • the antenna circuit 222 here has an inductance of 418nH.
  • Such an antenna circuit 310 is elongated and of small section, which for example turns out to be advantageous for integration into a rope, as detailed below. The simulations have shown that a relatively long antenna circuit 310 does not adversely affect the accuracy of locating the specific relative position.
  • the figure 9 is a perspective view of the antenna circuits 222, 232 and 310 for the specific relative position of the reader 2 and of the receiver 3.
  • the cylinders carrying the antenna circuits 222 and 232 have the same axis as the helix of the circuit d antenna 310.
  • the antenna circuit 310 indeed has a mutual inductance that is substantially zero with respect to the antenna circuit 232, and a mutual inductance that is not zero with respect to the antenna circuit 222.
  • the antenna circuits 222 and 232 are centered with respect to each other and aligned.
  • the antenna circuits 222 and 232 indeed have here geometrically almost zero mutual inductances.
  • the figure 11 is a perspective view of antenna circuits and an antenna coil of a variant, illustrating another example of a transmit / receive antenna circuit 222 of the radiofrequency reader 2, and another example of a circuit d The receiving antenna 232 of the radio frequency reader 2.
  • the orientation of the antenna circuit 310 with respect to the antenna circuits 222 and 232 is also different.
  • the antenna circuit 222 comprises a wire conductor track formed on a plane.
  • the conductive track can be made of copper.
  • the antenna circuit 222 chosen here generally follows the contour of a rectangle.
  • the antenna circuit 222 chosen has a length of 90 mm, a width of 60 mm and a wire diameter of 1 mm.
  • the antenna circuit 222 here has an inductance of 267nH.
  • the antenna circuit 232 comprises a wire conductor track formed on a plane.
  • the conductive track can be made of copper, and provided on another face of the same support as the antenna circuit 222.
  • the antenna circuit 232 chosen has a length of 100 mm, a width of 100. mm, and a wire diameter of 1 mm.
  • the antenna circuit 232 here has an inductance of 515nH.
  • the wire conductive track of the antenna circuit 232 generally comprises two rectangular loops connected in series and in opposite directions to have a substantially 8-shaped shape.
  • the antenna circuit 310 has the same geometry and the same structure as in the example described with reference to figure 8 .
  • the antenna circuit 310 thus has a conductive wire wound in a helix, the axis of which is perpendicular. in the plane of the antenna circuits 222 and 232. The axis of this winding passes through the geometric center of the antenna circuits 222 and 232.
  • the figure 12 a diagram illustrating the inductive couplings of the reader antennas with respect to the label antenna of the variant of the figure 11 , according to their relative positions. It can be seen that when the antenna circuit 310 is moved along a straight line parallel to the plane of the antenna circuit structure 222 and 232, at a distance of 50mm in the plane of symmetry of this structure and passing in front of the geometric center, for the relative specific position, the mutual inductance between the antenna circuit 222 and the circuit 310 is maximum, while the mutual inductance between the antenna circuit 232 and the antenna circuit 310 is zero.
  • the figure 13 is a perspective view of antenna circuits and an antenna coil of a variant illustrating another example of a transmit / receive antenna circuit 222 of the radiofrequency reader 2, and another example of a transmission circuit.
  • the orientation of the antenna circuit 310 with respect to the antenna circuits 222 and 232 is also different.
  • the antenna circuit 222 comprises a wire conductor track formed on a plane.
  • the conductive track can be made of copper.
  • the antenna circuit 222 chosen here generally follows the contour of an external circle, with two windings, joining the contour of a circle, with two extensions for the connections. This circle has a diameter of 115mm and a wire diameter of 1mm.
  • the inductance here is 392 nH.
  • the antenna circuit 232 comprises a wire conductive track formed on a plane parallel to the antenna circuit 222.
  • the conductive track may be made of copper, and formed on another face of the same support as the antenna circuit 222.
  • the antenna circuit 232 chosen here generally follows the contour of an external circle, with two windings, joining the contour of an internal circle, with a winding.
  • the diameter of the inner circle is 100mm
  • the diameter of the outer circle is 200mm
  • the wire diameter is 1.6mm.
  • the inductance here is 2329 nH.
  • the circles of antenna circuits 232 and 222 are concentric.
  • the figure 14 is a diagram illustrating the inductive couplings of the reader antennas relative to the label antenna of the variant of the figure 13 , according to their relative positions. It can be seen that when the antenna circuit 310 is moved along the axis perpendicular to the plane of the antenna circuits 222 and 232 and passing through their geometric center, for the relative specific position (antenna circuit 310 at a distance zero of said plane), the mutual inductance between the antenna circuit 222 and the antenna circuit 310 is maximum, while the mutual inductance between the antenna circuit 232 and the antenna circuit 310 is zero.
  • the figure 15 is a projection view of antenna circuits of a variant.
  • the reader 2 comprises two reception antenna circuits 232 and 233. These antenna circuits have substantially the geometry of the antenna circuit 232 of the device. figure 11 .
  • the antenna circuits 222, 232 and 233 are in parallel planes, typically separated by a dielectric layer.
  • the antenna circuits 232 and 233 are rotated 90 ° in the example.
  • the antenna circuit 310 has the same geometry and the same structure as in the example described with reference to figure 8 .
  • the antenna circuit 310 thus has a conductive wire wound in a helix, the axis of which is perpendicular to the plane of the antenna circuits 222, 232 and 233 and passing through their geometric center. In the relative specific position, the antenna circuit 310 has its axis passing through the geometric center of the antenna circuits 222, 232, and 233. If the antenna circuit 310 is moved in a plane including the relative specific position , this will be identified when the antenna circuit 310 reaches it.
  • the figure 16 illustrates a diagram of the inductive coupling of one of the reception antenna circuits of the reader with respect to the specific relative position, in the case where the receiver 3 is moved on a rectilinear path in a plane parallel to the plane of the circuit structure antenna 222, 232 and 233 and passing through the specific position point.
  • the inductive coupling between one of the receiving antenna circuits is plotted as a function of the angle of incidence 0 of the trajectory with respect to the straight line of the plane in intersection with the plane of symmetry of the receiving antenna circuit.
  • only an inductive coupling diagram of the transmit / receive antenna circuit is illustrated, this coupling being little impacted by the value of the angle ⁇ .
  • the mutual inductance between the antenna circuit 310 and the antenna circuit 222 remains maximum for the relative specific position, whatever this angle of incidence. It is also noted that the mutual inductance between the antenna circuits 232 and 233 and the antenna circuit 310 is zero for the relative specific position, whatever this angle of incidence. It is also noted that when the angle of incidence 0 takes a value close to 90 ° and that then the inductive coupling diagram between the antenna circuit 310 and the receiving antenna circuit from which the angle of incidence no longer allows discrimination of the relative specific position, the second receiving antenna circuit then allows this discrimination (the angle of incidence defined with respect to this second circuit is ⁇ + ⁇ / 2).
  • the figure 10 is a diagram illustrating the inductive coupling of the antenna circuits 222 and 232 with the antenna circuit 310 during a sliding of the receiver 3 with respect to the reader 2, with passage through the relative specific position illustrated in perspective at the bottom. figure 9 .
  • the abscissa corresponds to the distance from this specific relative position during sliding.
  • the coupling between the antenna circuit 222 and the antenna circuit 310 (shown in dotted lines) has three extrema (at positions -65, 0 and + 65mm) and two minima (at positions -40, and over 40mm). Potentially, the communication from reader 2 to receiver 3 and the power supply of receiver 3 by reader 2 can be carried out in three different locations of this course.
  • the inductive coupling between the antenna circuit 233 and the antenna circuit 310 changes from a value of -0.1% to + 0.1% over a distance of 10 mm containing the specific relative position. Since this minimal inductive coupling zone is particularly short, the specific relative position between reader 2 and receiver 3 can be identified very precisely.
  • the processing circuit 24 may condition the identification of a minimum of the mutual inductance between the antenna circuit 232 and the antenna circuit 310 on the following requirement: the mutual inductance between the circuit of antenna 232 and the antenna circuit 310 must first exceed a threshold. It is thus possible to determine that the minimum of mutual inductance detected corresponds to the specific relative position.
  • the one of the two objects which is mobile can for example be guided along a path passing in the specific relative position between the reader 2 and the receiver 3.
  • the receiver 3 is integrated in a rope 4.
  • the receiver 3 is for example positioned at the level of the neutral fiber of the rope 4.
  • the rope 4 is here guided to scroll in front of the fixed reader 2.
  • the receiver 3 will pass through the relative specific position illustrated by the cross 9 (the cross 9 identifies a fixed location compared to reader 2). The instant of passage of the receiver 3 through the cross will thus be able to be identified extremely precisely.
  • the mutual inductance between this antenna circuit 310 and the antenna circuit 232 is not altered by a rotation of the cord 4 around its axis. Indeed, its mutual inductance respectively with the antenna circuit 222, the antenna circuit 232 is invariant as a function of a rotation around its axis.
  • the string 4 can be provided with several receivers 3 having known positions along this string 4, at the time of manufacture of this string 4.
  • the receivers 3 are for example arranged at identical distance increments on along this chord 4. If we make the chord 4 scroll at a predetermined speed, we can measure the time intervals separating the detection of two successive receivers 3. We can then deduce therefrom the effective distance (distance on the curvilinear abscissa along the chord 4) between the successive receivers 3. A measurement of the distance between the successive receptors 3 makes it possible, for example, to determine the elongation of the cord due to its aging or due to the initiation of a break. We can thus anticipate the need to replace such a rope 4.
  • the relative trajectory of a receiver 3 with respect to a reader 2 is predefined by guidance, so that during a race along this trajectory, the receiver 3 and the reader 2 are transiently in their specific relative position, giving rise to detection.
  • the processing circuit 24 typically comprises a low noise amplifier 242 connected to the antenna circuit 222.
  • the low noise amplifier 242 is connected to a signal processing circuit 243 configured to extract the components of the signal from the antenna circuit 222, relating to the load modulation carried out by the receiver 3 for the return communication.
  • this return frame signal is materialized by a return sub-carrier signal modulated by the baseband signal, after modulations of the carrier (the center frequency of the electromagnetic field generated by the antenna circuit 222, typically at 13.56 MHz).
  • the use of a sub-carrier for return communication is preferable, in order to achieve reliable and rapid detection of the specific relative position.
  • the processing circuit 24 typically comprises a low noise amplifier 246, connected to the antenna circuit 232.
  • the low noise amplifier 246 is connected to a signal processing circuit 245, configured to extract the signal components from the antenna circuit. 232, relating to the load modulation carried out by the receiver 3, during its return communication.
  • the determination of a minimum of inductive coupling of the antenna circuit 232 with the antenna circuit 310 of the receiver 3 results in a minimum of the components of the signal relating to the load modulation.
  • the processing circuit 24 comprises a circuit 244 for calculating the correlation between the return signal on the antenna circuit 222 and the signal on the antenna circuit 232, in order to increase the measurement precision of the component. sub-carrier, in particular by adding a notion of phase.
  • Reader 2 and receiver 3 could for example comply with ISO14443, ISO18000-3 or ISO15693 standards for a communication frequency of 13.56 MHz, or ISO18000-2 for a communication frequency at a level lower than 135kHz.
  • An HF communication frequency (between 3 and 30 MHz) will be favored to improve the speed of detection while remaining in the field of coupled inductive circuits.
  • the load modulation by the receiver is carried out at an intermediate rate, called the sub-carrier frequency (a sub-multiple of the carrier frequency of 13.56 MHz).
  • the communication between the antenna 22 and the tag 3 can be carried out according to protocols known per se to those skilled in the art.
  • the information of a memory of an RFID-type receiver 3 can be updated by the reader 2.
  • the receiver 3 has a memory in which the reader 2 can write or change data. information, just after the detection of the specific relative position.
  • the reader 2 comprises a single reception antenna circuit 232. It is also possible to envisage providing the reader 2 with several reception antenna circuits with different types. orientations, in order to be able to detect different specific relative positions with respect to a receiver 3.

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Claims (12)

  1. System (1) zur Erfassung einer spezifischen relativen Position zwischen einem Hochfrequenzleser (2) und einem Hochfrequenzempfänger (3), dadurch gekennzeichnet, dass es umfasst:
    - einen Hochfrequenzempfänger (3) vom induktiven kontaktlosen Typ, der eine Antennenwicklung (310) und eine Schaltung (30), die dafür ausgelegt ist, selektiv die elektrische Last an den Klemmen der Antennenwicklung zu modulieren, umfasst;
    - einen kontaktlosen Hochfrequenzleser (2) vom induktiven Typ, welcher umfasst:
    - eine Sende-/Empfangsantennenschaltung (222), die eine von null verschiedene Gegeninduktivität mit der Antennenwicklung (310) des Hochfrequenzempfängers für die spezifische relative Position aufweist;
    - eine Kommunikationsschaltung, die eine Hochfrequenzsendekette und eine Hochfrequenzempfangskette umfasst, die mit der Sende-/Empfangsantennenschaltung (222) verbunden sind;
    - eine Empfangsantennenschaltung (232), die eine Gegeninduktivität mit der Antennenwicklung (310) des Hochfrequenzempfängers aufweist, die für die spezifische relative Position ein Minimum aufweist;
    - eine Verarbeitungsschaltung (24), die mit der Sende-/Empfangsantennenschaltung (222) verbunden ist und ausgelegt ist zum:
    - Identifizieren des Vorhandenseins eines Empfängers durch Erfassen einer von null verschiedenen Gegeninduktivität zwischen der Sende-/Empfangsantennenschaltung (222) und einer Antennenwicklung (310);
    - Erfassen eines Minimums der Gegeninduktivität zwischen der Empfangsantennenschaltung (232) und einer Antennenwicklung (310);
    - Bestimmen, bei einer Identifizierung des Vorhandenseins eines Empfängers gleichzeitig mit der Erfassung eines Minimums der Gegeninduktivität zwischen der Empfangsantennenschaltung (232) und einer Antennenwicklung, dass sich der Leser (2) und ein Hochfrequenzempfänger (3) in der spezifischen relativen Position befinden.
  2. System (1) zur Erfassung nach Anspruch 1, wobei die Sende-/Empfangsantennenschaltung (222) eine von null verschiedene Gegeninduktivität mit der Antennenwicklung (310) aufweist, wenn der Leser (2) und der Empfänger (3) eine Entfernung von weniger als 20 mm von der spezifischen relativen Position aufweisen.
  3. System (1) zur Erfassung nach Anspruch 1 oder 2, wobei die Verarbeitungsschaltung (24) dafür ausgelegt ist, nur zu bestimmen, dass sich der Leser (2) und der Hochfrequenzempfänger (3) in der spezifischen relativen Position befinden, nachdem sie zuvor die Erfassung einer Gegeninduktivität zwischen der Empfangsantennenschaltung (232) und einer Antennenwicklung identifiziert hat, die größer als ein Schwellenwert ist.
  4. System (1) zur Erfassung nach einem der vorhergehenden Ansprüche, wobei der induktive Kopplungsfaktor zwischen der Empfangsantennenschaltung (232) und der Sende-/Empfangsantennenschaltung (222) kleiner als 1 % ist.
  5. System (1) zur Erfassung nach einem der vorhergehenden Ansprüche, wobei der Empfänger (3) ein RFID-Etikett ist.
  6. System (1) zur Erfassung nach einem der vorhergehenden Ansprüche, wobei die Hochfrequenzsendekette dafür ausgelegt ist, über die Sende-/Empfangsantennenschaltung mit einer ersten Frequenz zu kommunizieren, wobei die Schaltung (30) des Empfängers dafür ausgelegt ist, selektiv die elektrische Last an den Klemmen der Antennenwicklung (310) mit einer Frequenz zu modulieren, die von der ersten Frequenz verschieden ist.
  7. System (1) zur Erfassung nach Anspruch 6, wobei die Schaltung (30) des Empfängers dafür ausgelegt ist, selektiv die elektrische Last an den Klemmen der Antennenwicklung (310) auf einen Unterträger der ersten Frequenz zu modulieren.
  8. System (1) zur Erfassung nach einem der vorhergehenden Ansprüche, wobei die Sende-/Empfangsantennenschaltung (222) eine Länge aufweist, die mindestens doppelt so groß wie die Länge der Antennenwicklung (310) ist.
  9. System (1) zur Erfassung nach einem der vorhergehenden Ansprüche, wobei die Verarbeitungsschaltung (24) dafür ausgelegt ist, eine Korrelation zwischen einem auf der Sende-/Empfangsantennenschaltung (222) empfangenen Signal und einem auf der Empfangsantennenschaltung (232) empfangenen Signal zu berechnen.
  10. System (1) zur Erfassung nach einem der vorhergehenden Ansprüche, welches außerdem eine Vorrichtung zur Führung der relativen Bewegung zwischen dem Hochfrequenzleser (2) und dem Hochfrequenzempfänger (3) entlang einer vordefinierten Bahn umfasst, wobei die vordefinierte Bahn durch die spezifische relative Position verläuft.
  11. System (1) zur Erfassung nach Anspruch 10, welches außerdem eine lang gestreckte Komponente (4) umfasst, die entlang der vordefinierten Bahn in Bezug auf den Hochfrequenzleser (2) geführt wird, wobei die lang gestreckte Komponente mehrere der Hochfrequenzempfänger aufweist, die an verschiedenen Stellen entlang der lang gestreckten Komponente (4) befestigt sind.
  12. Verfahren zur Erfassung einer spezifischen relativen Position zwischen einem Hochfrequenzleser (2) und einem Hochfrequenzetikett (3), wobei:
    - der Hochfrequenzempfänger (3) vom induktiven kontaktlosen Typ ist und eine Antennenwicklung (310) umfasst;
    - der Leser ein kontaktloser Hochfrequenzleser vom induktiven Typ ist, der umfasst:
    - eine Sende-/Empfangsantennenschaltung (222), die eine von null verschiedene Gegeninduktivität mit der Antennenwicklung (310) des Hochfrequenzempfängers für die spezifische relative Position aufweist;
    - eine Empfangsantennenschaltung (232), die eine Gegeninduktivität mit der Antennenwicklung (310) des Hochfrequenzempfängers aufweist, die für die spezifische relative Position ein Minimum aufweist;
    wobei das Verfahren die Schritte umfasst:
    - Senden eines Hochfrequenzsignals über die Sende-/Empfangsantennenschaltung (222) des Hochfrequenzlesers;
    - Modulieren einer elektrischen Last an den Klemmen der Antennenwicklung des Empfängers in Reaktion auf das Senden des Hochfrequenzsignals;
    - Identifizieren des Vorhandenseins des Empfängers (3) durch Erfassen einer von null verschiedenen Gegeninduktivität zwischen der Sende-/Empfangsantennenschaltung (222) und der Antennenwicklung (310);
    - Bestimmen, bei der Identifizierung des Vorhandenseins des Empfängers gleichzeitig mit einer Erfassung eines Minimums der Gegeninduktivität zwischen der Empfangsantennenschaltung (232) und der Antennenwicklung (310), dass sich der Leser (2) und der Hochfrequenzempfänger (3) in der spezifischen relativen Position befinden.
EP17757796.2A 2016-08-01 2017-07-27 Verfahren und system zum erfassen einer spezifischen relativen position zwischen zwei objekten Active EP3491577B1 (de)

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FR1657482A FR3054695B1 (fr) 2016-08-01 2016-08-01 Procede et systeme de detection d'une position relative specifique entre deux objets
PCT/FR2017/052107 WO2018024967A1 (fr) 2016-08-01 2017-07-27 Procede et systeme de detection d'une position relative specifique entre deux objets

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US11750037B2 (en) 2021-06-22 2023-09-05 Nucurrent, Inc. Dynamic operation adjustment in wireless power transfer system
EP4360190A1 (de) * 2021-06-22 2024-05-01 NuCurrent, Inc. Dynamische betriebseinstellung in einem drahtlosen stromübertragungssystem
US11456627B1 (en) * 2021-06-22 2022-09-27 Nucurrent, Inc. Dynamic operation adjustment in wireless power transfer system

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US5929760A (en) * 1997-10-20 1999-07-27 Escort Memory Systems RFID conveyor antenna
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US10802172B2 (en) 2020-10-13
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FR3054695B1 (fr) 2018-08-24
FR3054695A1 (fr) 2018-02-02

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